Intext examples II — task. Science State Board, Class 10.

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A source producing a sound of frequency $90$ $Hz$ is approaching a stationary listener with a speed equal to ($1/10$) of the speed of sound. What will be the frequency heard by the listener?

When the source is moving towards the stationary listener, the expression for apparent frequency is

$n^{'} = (\frac{v}{v - v_{s}}) n$
$n^{'} = (\frac{v - v_{s}}{v}) n$

Apply the know values in the relation, we get

The frequency is .

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22. Intext examples II

Exercise condition: